Depends on the construction. Older holes used plaster and lath. Modern dry wall is pretty good at dead ending sound as well. If there’s an issue with sound the

Depends on the construction. Older holes used plaster and lath. Modern dry wall is pretty good at dead ending sound as well. If there’s an issue with sound then you can install dampening material in the wall or floor. You’re more likely to have noise travel through vents though. In some places with high humidity though you want the home to breath to prevent mold, etc. Otherwise it gets damp and stays damp.